The NHS is urging people across the UK to follow a ‘face mask rule’ when going outside in cold weather this winter.

It comes as the country braces for a major change to weather conditions from Thursday, as a powerful jet stream pushing low pressure across the Atlantic heads to the UK.

Storm Eowyn will bring heavy rain, 90mph winds and even snow in some parts, with several weather warnings in force over the next few days.

A rare red warning for wind has been issued by the Met Office for Northern Ireland and central and southwestern areas of Scotland and Friday, while wider amber and yellow warnings for wind, rain and snow are also in place.

On Friday the entire UK is covered by at least one yellow weather warning as forecasters warn people to prepare for strong winds, power cuts, possible flooding and widespread travel disruption.

Met Office chief meteorologist Paul Gundersen said: “Storm Éowyn is a multi-hazard event, with snow likely for some, rain for many and strong winds for much of the UK. As a result, a number of weather warnings have been issued, with all parts of the UK covered by one warning at some point on Friday.

“Storm Éowyn is expected to cross Northern Ireland early on Friday morning. It will then continue northeast across the northern half of Scotland during Friday afternoon and is expected to be centred near Shetland during Friday evening.

“It’s important to note that even those away from the immediate Red Warning areas will still likely see disruptive weather, with travel plans likely to be severely impacted, as well as the possibility of power cuts for some.”

While the storm will predominantly bring strong winds, snow will add an additional hazard so people are being urged to take precautions if heading outside in cold weather.

The NHS warns that cold weather can be a trigger for asthma symptoms and says people should wear a scarf over their face like a mask to help protect against the cold.

Using a scarf like a face mask allows the air to warm up before it is breathed in, helping to reduce the risk of symptoms being triggered. It’s also advised that you breathe in through your nose instead of your mouth as this also warms the air as you breathe.

The health service says: “Cold weather is a common trigger for asthma symptoms. There are things you can do to help control your symptoms in the cold.

“Carry your reliever inhaler with you at all times and keep taking your regular preventer inhaler as prescribed. If you need to use your inhaler more than usual, speak to your doctor about reviewing your treatment.

“Keep warm and dry – wear gloves, a scarf and a hat, and carry an umbrella. Wrap a scarf loosely over your nose and mouth – this will help warm up the air before you breathe it. Try breathing in through your nose instead of your mouth – your nose warms the air as you breathe.”